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利用范畴论中范畴与函子的概念,定义了动力系统范畴T到包络半群范畴E的共变函子F1及范畴丁到范畴E＊的反变函子F2,并分别讨论了范畴丁中乘积系统的包络半群与范畴E中包络半群直积的一致性及范畴T中逆极限系统的包络半群与范畴E中包络半群逆极限的一致性． 相似文献
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设C,D是两个范畴,S,T∶C→D是两个函子,η∶S→T是自然变换,另外T0T1C→C×2分别是顶函子和底函子,μ∶T0→T1是自然变换.给出由μ和η分别确定的自然范畴Nat（μ）与Nat（η）间的关系,最后用一个例子说明了这个关系. 相似文献
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引入几个偏序范畴的相关概念,如链、偏序范畴之间的函子的矩阵表示等。首先解决了两个n秩偏序范畴之间函子的矩阵表示的存在性问题,其次给出了D4型Dynkin图作为偏序范畴上所有自函子的矩阵刻画。 相似文献
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证明了k上G-分次范畴的函子范畴仍是k上G-分次范畴.并在此基础上,考虑k上G-分次范畴的冲积范畴与函子范畴的关系,证明了(D#G)C≌DC#G. 相似文献
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任芳 《福建工程学院学报》2012,10(6):529-532,587
证明任意半环上的半模范畴是加性regular范畴,并给出半模的函子表示。证明了加性regular范畴关于伴随对的左右平凡扩张范畴是同构的。最后应用至半模范畴,得到半环S的半模范畴S-S Mod关于Hom函子Homs（M,）的左平凡扩张范畴HomS（M,）∝S-SMod和S-SMod关于张量函子M×S-的右平凡扩张范畴S-SMod∝×S-是范畴等价。 相似文献
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Type 1 diabetes mellitus (T1DM) is a chronic illness that can impact learning and often requires medical management in the school setting. School psychologists must therefore be knowledgeable of special service eligibility criteria associated with T1DM, the health‐related services often required of such students, and what health‐related services schools are obliged to provide. Although federal regulations speak to special service eligibility criteria to consider for children with T1DM, such codes do not outline what health services schools are expected to provide. One way to glean this information is by examining published case decisions involving diabetes health‐related services in the schools. Themes and examples in five decision categories provide vital information for school psychologists regarding school service planning for T1DM. © 2010 Wiley Periodicals, Inc. 相似文献
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徐行 《宁波职业技术学院学报》2007,11(6):96-100
以《期刊出版管理条例》、国际标准ISO3297:1998—国际连续出版物号(ISSN)、国家标准GB/T9999-2001—中国连续出版物号(CN)以及新闻出版执法部门目前掌握的情况为依据,界定了非法期刊的范围,阐述了非法期刊的主要表现形式,将现在已知的所有识别非法期刊的方法进行了总结并归纳为6大类。 相似文献
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史惠风 《安庆师范学院学报(社会科学版)》2009,28(2):121-124
T．E．劳伦斯现存的五千多封书信大体分为家信、外交与军事、文学以及朋友之间的四类通信,它们展现了劳伦斯参与的军事、外交、文学、翻译、出版、考古、交游以及他所经历的时代风云与社会变迁的诸多方面。西方对劳伦斯书信研究的历史较长,但还没有较为系统、完整的成果面世,因而仍有深入研究的意义。 相似文献
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Rachel L. Bissett Michael S.H. Cheng Robert G. Brannan 《Journal of Food Science Education》2010,9(1):11-18
ABSTRACT: Professional organizations have linked core competency to professional success and competitive strategy. The Research Chefs Assn. (RCA) recently released 43 core competencies for practicing culinologists. Culinology® is a profession that links skills of culinary arts and food science and technology in the development of food products. An online survey was created asking RCA members from all 6 membership categories (Associate, Affiliate, Chef, Culinology, Food Science and Technology (FS&T), and Student) to rate their knowledge level based on a 7‐point scale and agreement to importance in job performance based on a 5‐point Likert scale for each competency statement. RCA participant's (N = 192) survey results were analyzed using SPSS for Windows version 13.0 at a significance level of P < 0.05. Statistical survey validation grouped all 43 competency statements into 8 factors (groupings) according to level of competency proficiency (opposed to the 7 groups each competency was originally designated by the RC A) and into 9 factors according to job success. Results suggest that Chef Members know “Culinary Arts” best and FS&T members know “Food Science” best. A gap analysis determined what competency factors were low in knowledge level yet important to job success for each membership category. Chef members have a lower level of knowledge in “Product Development,”“Food Science,” and “Quality Assurance” factors; however, the factors are important to job success. FS&T members have a lower level of knowledge in “Nutrition” yet identified the factor important to job success. An opportunity exists to improve educational efforts for specific membership categories. 相似文献
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Janet U. Schneiderman Caitlin Smith Janet S. Arnold-Clark Jorge Fuentes Lei Duan 《Child abuse & neglect》2013
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The aims of this study of predominately racial/ethnic minority children in foster care (N = 360, birth to 19 years old) in Los Angeles, CA were to examine the (1) prevalence of obesity (≥95 percentile) and overweight/obese (≥85 percentile) upon entrance to foster care (T1) and after 1 year in foster care (T2); (2) comparison of high weight categories to national statistics; (3) relationship of changes in weight status to age, reason for entry into foster care, and placement.Methods
Chi-square test and McNemar test comparing paired proportions were used to determine whether there were significant changes in the proportion of high weight categories between T1 and T2. Chi-square test or Fisher's exact test were used to evaluate the association between age, placement, and reason for foster care with the change in weight category. Changes in weight were categorized as (1) decreased in weight, (2) remained at overweight or obese, (3) increased in weight, or (4) remained normal.Results
The proportion of obese and obese/overweight children between ages 2 and 5 were significantly lower at T2 than T1. There were no significant changes in the prevalence of obesity for the total population at T2. Children age 6 or older had a higher prevalence of obesity and overweight/obesity compared to national statistics. Of children at all ages, 64.7% of children of all ages entered foster care with a normal weight and stayed in the normal range during their first year in foster care, 12.2% decreased their weight, 15.4% remained overweight or obese, and 7.7% increased their weight. Age and parental substance use was related to change in weight category from T1 to T2.Conclusion
Children did not become more overweight or obese in foster care; however 28% of the children were obese or overweight upon entry into foster care. Children who are 6 years or older and obese upon entering foster care should be targeted for weight reduction. The pediatric community and child welfare system need to work together by including weight percentiles in the foster care file and training/monitoring child welfare caregivers in weight reduction interventions. 相似文献16.
Respondents (n=34) participated in three rounds of a Delphi study to determine dimensions that should be included in the evaluation of full-time head coaches at NCAA Division II institutions. Delphi panel members included athletic directors, intercollegiate head coaches, and student-athletes at randomly selected NCAA Division II institutions. In total, 175 (92.6 per cent) of the initial 189 unique behaviors reached consensus for inclusion. Only two behaviors (1.1 per cent) reached consensus for exclusion. Twelve behaviors (6.3 per cent) failed to reach consensus. Differences between respondent groups were found in only seven (3.7 per cent) of the 189 behaviors. Only small absolute differences in mean importance ratings of the twenty categories were found. To develop a more practical evaluation tool, the results obtained were refined, lowering the number of categories to fifteen and the number of behaviors to ninety-one. The refined evaluation tool contains the most important dimensions for evaluating head coaches. It represents the essentials of a coaching evaluation. 相似文献
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This study replicates and extends research on college students’ sexual possible selves by longitudinally examining their sexual expectations, fears, and behavioral strategies at the beginning and end of the first semester in college. Open-ended responses were collected at two time points (T1, N?=?78; T2, N?=?40) and were analyzed using directed content analysis. First semester students’ salient expectations and fears focused on abstinence, interpersonal relationships, quantity, conditional sex, decreasing/avoidant behaviors, and fears related to sexual health/well-being, sexual assault/coercion, self-focus, and increased sexual risk at both T1 and T2. However, two new themes emerged at T2: maintain (expected) and partner-focus (feared). At both time points, behavioral strategies included abstinence, making opportunities, restricting boundaries, sexual health/well-being, thoughtful/informed decisions, and self-assertion/protection. Quantitative frequency comparisons were also conducted to examine changes in the prevalence of the reported categories and indicated shifts in salient expectations, fears, and strategies across the first semester. Implications for sexual education are discussed. 相似文献
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介绍了六书到三书的发展,并比较了六书和三书的异同以及现代学者三书说之间的优长,认为在归纳汉字结构方面,无论是传统的六书还是现代的三书,都有偏颇之处,都不能涵盖古今所有汉字的结构类型。分析了古今汉字的结构类型,用大量的字例证明,汉字的结构原理应该是四书,即表意字、形声字、假借字和记号字。 相似文献
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